and yes, flexing also causes tiny tears in fibers, flexing is also work for muscle, i don't say that it effective, no. but it also make your muscle work and cause tears.
1. There is a civilized way to say somebody that he wrong, i he has dust instead of his brain, i can't do nothing better than insulting him back.
2. It's involved just because it's flexed by little...
1) I'll call him how i want, if he calls me moron.
2) I didn't said that chest is stimulated, or said that curl is chest exercise. I said that chest is also involved there because it's flexing...
you dumbass. http://webcast.bodybuilding.com/fitshow/fitshow/episode32/episode32.htm - watch this video and see how his pecs flexing when he does barbell curl.